Digging attachment for bulldozers



April 13, 1954 E. CARNES DIGGING ATTACHMENT FOR BULLDOZERS 2 Sheets-Sheet 1 Filed Oct. 18, 1948 Ear/ Games M mmvrox.

April 13, 1954 E. CARNES ,3

nzccmc ATTACHMENT FOR BULLDOZERS Filed Oct. 18, 1948 2 Sheets-Sheet 2 Fig. 2.

Earl Games INVENTOR.

Patented Apr. 13, 1954 UNITED STATES PATENT 0F FICE DIGGING ATTACHMENT FDR BULLDOZERS Earl Games, Safford, Ariz. Q

ApplicationOctober 18, 1948, Serial No. 55,066

The present invention relates generally to new and useful improvements in earth handling equipment and more particularly to a digging or scarifying attachment for the moldboard of a bulldozer.

An important object of the invention is to provide a plurality of digging or scarifying teeth pivotally attached at the upper edge of the moldboard of a bulldozer together with hydraulic means controlled by the operator of the bulldozer for raising and lowering the teeth into and out of digging position in front of the moldboard.

A further object of the invention is to provide a digging attachment of this character including a plurality of uprights detachably secured at their upper ends to a shaft rockably mounted at the upper edge of a moldboard, rigidly connecting the uprights to each other by cross bars and providing detachable teeth for the lower ends of the uprights whereby any one of the teeth,

or uprights may be removed and replaced, should the same become damaged, without necessitating complete removal of the digging attachment.

A still further object is to provide an attachment of this character of simple and practical construction, which may be easily and quickly mounted in position on the moldboard of a bulldozer, which is efiicient and reliable in operation, relatively inexpensive to manufacture and otherwise well adapted for the purposes for which the same is intended.

Other objects and advantages reside in the details of construction and operation as more fully hereinafter described and claimed, reference being had to the accompanying drawings forming part hereof, wherein like numerals refer to like parts throughout, and in which:

Figure 1 is a side elevational view;

Figure 2 is a front elevational view;

Figure 3 is a top plan view; and

Figure 4 is a group perspective view showing one of the detachable uprights and teeth for the digging attachment.

Referring now to the drawings in detail wherein for the purpose of illustration I have disclosed a preferred embodiment of the invention the numeral 5 designates generally a bulldozer of conventional construction and which includes a moldboard 6 supported at the front end of a vertically adjustable frame 1 to provide for the board, the shaft having pairs of spaced apart parallel lugs l0 welded or otherwise suitably secured thereto and extending downwardly therefrom. An upright l l is secured at its upper end between each pair of lugs Ill by a bolt and nut or the like [2 to detachably connect the upright in a rigid position to the shaft for raising and lowering movement of the upright by a rotation of the shaft.

The uprights I i are rigidly connected to each other for uniform raising and lowering movement by means of upper and lower crossbars l3 and 14 also provided with pairs of spaced parallel lugs l5 projecting rearwardly therefrom and detachably secured to the uprights.

Channel-shaped teeth It are detachably secured to the lower end of the uprights II to project downwardly below the lower edge of the moldboard 6 as shown in Figure l of the drawmg.

Arms I! are suitably secured at one end to the shaft 8 and extend upwardly and forwardly therefrom and to the upper ends of which piston rods I8 are pivotally attached and extend downwardly in hydraulic cylinders 19 which. are pivotally attached at their lower ends to the front portion of the frame 5. Fluid pressure supply lines 28 are suitably attached to the cylinders [9 for operating pistons (not shown) working in the cylinders in the usual manner to move the piston rods l8 inwardly and outwardly to raise and lower the digging attachment. Pressure is supplied to the cylinders I9 by the usual hydraulic lift of the bulldozer.

Angular brackets 2| are attached to each end of the cross bars 13 and M for engaging the side edges of the moldboard 6 when the digging attachment is lowered in front of the moldboard to hold the cross bars from endwise movement and thus rigidly hold the uprights I I against lateral twisting or shifting movement on the moldboard.

Any one of the uprights H or teeth [6 may be easily and quickly removed and replaced when desired, without disturbing the other parts of the attachment.

In view of the foregoing description taken in conjunction with the accompanying drawings it is believed that a clear understanding of the device will be quite apparent to those skilled in this art. A more detailed description is accordingly deemed unnecessary.

It is to be understood, however, that even though there is herein shown and described a preferred embodiment of the invention the same is susceptible to certain changes fully compre- 3 bended by the spirit of the invention as herein described and the scope of the appended claim.

Having described the invention, what is claimed as new is:

In combination, an earth working implement including a vertically swingable frame having a moldboard at its front end, bearing brackets at the upper edge of the moldboard, a shaft journaled in the bearing brackets, pairs of spaced apart apertured lugs projecting downwardly from the shaft, a plurality of uprights rigidly secured at their upper ends between said pairs of lugs and supported downwardly in front of the moldboard for vertical swinging movement by the turning of the shaft, teeth at the lower ends of the uprights, a cross bar having pairs of spaced apart lugs arranged in straddling position with respect to the uprights and attached thereto for rigidly connecting the uprights to each other,

a crank arm fixed to the shaft, and a hydraulic 4 cylinder carried by the frame and connected to the crank arm for rocking the shaft to raise and lower the uprights.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 331,358 Wood Dec. 1, 1885 1,607,227 Aitken Nov. 16, 1926 2,042,196 Senz May 26, 1936 2,171,830 Hayes Sept. 5, 1939 2,222,071 Gustafson Nov. 19, 1940 2,262,415 Williams et a1 Nov. 11, 1941 2,279,869 Houston Apr. 14, 1942 2,281,928 Fletcher May 5, 1942 2,297,677 Forte Oct. 6, 1942 2,302,702 Leschinsky Nov. 24, 1942 2,371,510 Sembler et a1. Mar. 13, 1945 2,521,045 COl'bBll Sept. 5, 1950 

